Level.



I 0. M. L. LARSEN.

LEVEL.

APPLICATION FILED JUNE 24, 1911.

1,014,402. Patented Jan. 9, 1912 6 19 1 A 2:1; V \71 I 14 e s: Zzverziof %V(M C67ZML'LQHSQfl COLUMBIA PLANOGRAPHCOQ WASHINGTON, D. c.

CARL M. L. LARSEN, OF CHICAGO, ILLINOIS.

LEVEL.

Application filed June 24., 1911.

Specification of Letters Patent.

Patented Jan. 9,1912.

Serial No. 635,217.

To all whom it may concern:

Be it known that I, CARL M. L. LARSEN, a citizen of the United States,and resident of Chicago, in the county of Cook and State of Illinois,have invented a new and useful Improvement in Levels, of which thefollowing is a specification.

The object of my invention is to provide an instrument of the kindentitled a level, which combines the principles and uses of a level,square, try square, plumb and protractor.

The manner in which I accomplish my object is described in the followingspecification and illustrated in the accompanying drawing in whichFigure 1 is a top plan, the parts being in position for use as a levelora plumb. Fig. 2 is a side elevation the parts being in position for useas a try square or protractor. Fig. 3 is a section on the line 33, Fig.1; Fig. 4 is an enlarged face of a dial shown in Figs. 1-2 and 3. Fig. 5is a bolt and nut of which the dial is an integral part.

In the drawings 6 indicates the body of the device. Set in this body aretwo spirit tubes 7 and 8. The first of these is for horizontal levelingand the second for a plumb. These tubes are secured in place andprotected by the plates 9 and'lO. The body 6 is mortised longitudinallyon the underside as indicated by the dotted lines 11, in Figs. 1 and 2and the solid lines 11 inFig. 3. Insertible in this mortise is an arm12. This arm is pivotally secured in the body 6 by a bolt 13 whichextends transversely through the body 6 and arm 12. This bolt iscylindrical at the parts 14 and 15 which form journals rotatable in thebearing apertures in the body 6, and the part 16 is square and is fittedfirmly in the squared aperture in the arm 12 and is thereby adapted toco-act with the movement of the arm 12. The head of this bolt is formedinto a dial 17 and marked to indicate 180 degrees of a circle. Slidableon the bolt 13;.are two washers 18 which are firmly fixed in the body 6.These washers form friction bearings for the dial 17 and thumb nut 19 bywhich the arm 12 is firmly clamped in the position desired. On the body6 is an indent 20 shown in Fig. 2 adapted to correspond with the zeromark 21 on the dial 17- when the device is closed and used for a level.In the arm 12 are two apertures 22 and 23, in which spirit tubes 24 and25 are secured. These tubes are arranged to register angles of 45 and 90degrees respectively, when the device is used as a try square or square.Otherwise the divisions of the dial are adapted to be used as a protractor of which the arm 12 and body 6 form the lines of the angledesired. When the arm is opened and placed in line with the body it isadapted to be used with the body as a plumb, one of the spirit tubes inthe arm co-acting with the tube at the end of the body, thus doublingthe length of the body for vertical use.

What I claim is 1. A device of the kind described, consisting of a mainbody provided with spirit tubes whereby said body is adapted for use asa level and plumb, and having a mortise and transverse bore and therebyadapted for the insertion of an arm in said mortise and the pivotalsupport of said arm in said body; an arm pivotally secured in saidmortise in said body, said arm having transverse bores adapted for theinsertion of spirit tubes therein, spirit tubes transversely secured insaid bores, a screw bolt adapted to extend transversely through saidbody and said arm and to thereby pivotally secure said arm in said body,said bolt being adapted tobe rotated in said body by the movement ofsaid arm, and having a dial which forms the head of said bolt and isrotatable with it, said dial having radial lines adapted to registerwith a mark on said body whereby said arm and body can be used as a protractor, washers slidable and rotatable on said bolt and sunk in saidbody, adapted to form bearing surfaces for said dial bolt and a nut, athumb nut on the threaded part of said bolt, adapted to be rotated onsaid bolt in contact with one of said washers and to thereby secure saidarm, in the position relative to said body, described as shown anddescribed.

2. A device of the kind described consisting of a mortised body portion,a plurality of spirit tubes therein and thereby adapting it for use as alevel and plumb, an arm pivotally secured in the mortised part of saidbody, a plurality of spirit tubes in said arm, whereby 'said arm andbody can be used as a level and plumb, and to test angular surfaces, andpivotal means adapted to secure said arm in said body, said meansincluding a dial whereby said arm and body can be used as a protractor,as described. CARL M. L. LARSEN. Witnesses:

G. T. FRAENCKEL, THOMAS J. MORGAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner'of Patents. Washington, D. G.

